seeped of boad in standing water is 9 kmph and the seeped of the steam is 1.5 kmph a man rows to a plance at a distance of 105 km and comes back to back to starting point​

Correct question is;

Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:

Total time = 24 hours

Step-by-step explanation:

We are given;

Speed of a boat in standing water = 9 kmph

Speed of the stream = 1.5 kmph

Distance rowed by the man; d = 105 km

He now came back to his starting point.

Thus, we can say that;

Speed upstream; V_up = 9 - 1.5 = 7.5 kmph

Speed downstream; V_down = 9 + 1.5 = 10.5 kmph

Now, we know that;

time = distance/speed

Thus;

Total time = time taken upstream + time taken downstrem

Total time = (105/7.5) + (105/10.5)

Total time = 14 + 10

Total time = 24 hours

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